Looking at porn is just as sinful as being with that stranger. We understand that. If they are a virgin but practice pornography they are in sexual sin and their virginity is nothing to boast about. I get that.
You would not want to marry someone addicted to porn even if they were a virgin.
However, marrying a virgin who is not addicted to, or guilty of porn is no indication of a successful marriage either. Someone could pick up a porn problem later.
My point is, do not put the emphasis on finding a virgin but rather find someone who is filled with the Holy Spirit and loving God and Jesus Christ with their whole heart, body, mind, and strength and who has a passion for fulfilling the great commission. Do not hold against them their past before they were born again, as long as they are living holy today and Christ has their whole heart. Make that your criteria and you will have a happy marriage and a happy life.
Yes, you can find someone like that who is also a virgin but their virginity does not give them any right-standing with God nor does yours. Remember that.